Telephone-receiver.



PATENTED. JUNE 4, 1907.

K. M. TURNER. TELEPHONE RECEIVER.

APPLICATION FILED FEB.5, 1907.'

1 TEEr sATEs AT 'E EET@ KELL'EY MONROE TURNER, OE NEW YORK, N. Y., Ass-IGNOR To GENERAL ACOUSTIC COMPANY, A CORPORATION OE NEW YORK.

TELEPHONE-RECEIVER.

Statement and Declaration.

Patented June 4, 1907.

Application filed February 5, 190.7. Serial No. 355,866.

To all whom it muy concern,.-

Be it known that I, KELLEY MONROE TURNER, a citizen of the United States, residingYat New York city, in the County of New Ork and State of New York, have invented certain new and useful Improvements in Telephone-Receivers, of which the following is a full, clear, and exact descript1on.

My invention relates to telephone receivers, particularly of that class employed in telephonie apparatus for the deaf, by which the deaf person is enabled to hear ordinary sounds by listening into a telephone circuit, including a specially constructed and very sensitive transmitter.

One of the principal difficulties met in apparatus of this description is that no two persons are 'deaf to exactly the same degree, and the deafness of any single person is apt to change from time to time, depending on atmospheric conditions, and ypossibly the permanent improvement of his condition, or the reverse. Apparatus which is sensitive enough to be audible to the deafest persons is altogether too loud for a large class of others. The difficulty can, of course, be overcome by having a great variety of telephone receivers of different sensitiveness,

and this, so far as I am aware, is the only plan in successful use up to the present time. In carrying out the present invention I overcome this dificulty by having a single re- .ceiver which is adjustable to different degrees of sensitiveness, and through a range sufficiently great to suit all the requirements of persons having varying degrees of deafness,

or in varying stages of improvement, or the reverse.

` With these and other objects in view, the invention .consists in the features of construction hereinafter set forth and claimed.

In the drawings: Figure l is a front or face view of a telephone receiver embodying the principles of my invention; Fig. 2 is a rear view of the same; Fig. 3 is a` view looking into the receiver with cover and diaphragm removed; Fig. 4 is a diagram of circuits;

In apparatus for the deaf, it is impracticabl'e to have rheostats and similar telephone engineering apparatus externally -of the transmitter and the receiver, which, of course, constitute the essential parts or elements of the'system. This is not only due to formed,

the trouble of carrying around so many appliances, but is also impractical on account of the fact that the average person does not wish to manage anything which looks like a complicated electrical system. Any regulating devices, should, therefore, form a part of the transmitter or the receiver of the set. In carrying out my invention I provide a regulating device, forming a part of the receiver, and which is so Compact as to require no more space, or larger instrument, than has been usually employed. The regulation 'is accomplished by a simple turn button or handle, which is sufliciently simple to satisfy all requirements. With a receiver of this character any deaf person is enabled to at once adjust its sensitiveness to suit his needs, and in case of different atmospheric conditions, or in case lhis 'condition is improved as it fre uently is by the use of these devices.

Re erring now to the drawings in which like parts are designated by the same reference sign, 1 indicates the casing of a telephone receiver, having a cover 2, with the usual central aperture 3, through which the sound is received at the ear.

4 (Fig. 3) are the usual magnet windings oncores 5, which form the pole pieces of the permanent magnets 6.

7 is a switch operated by the handle 8, for completing or opening the circuit of the Windings 4, for the purpose of throwing the receiver into and out of action.

The construction of the device and parts thus far described is of the ordinary character, and in itself constitutes no part of the present invention.

Within the telephone receiver is provided alittle circuitv controller9, which is capable of throwing diiierent circuits into connection .f

with the line, or, in other words, the transmitter. In thev construction shown, the different circuits include different portions of the iield windings 4, which are sectionally wound -for this pur ose. I consider this construction a very esirable one, because by utilizing the windin s themselves for varying the efficiency an sensitiveness of the recelver, a very compact construction 1s much more compact than would be the case if separate resistances were employed and included Within the receiver.

The diagram of circuits is shown in Fig. 4. It will be seen that each of the separate bob bins or windings is sectional, and has leads Z', Z2, Z3, Z4 and Z5, and n', n2, 11,3, n4 and n, for the respective bobbins. If the circuit is completed through the leads Z n', it is 5 evident that all of the windings of both bob- I,bins are in the circuit. If, however, the circuit is made through Z2 and fn?, only about four-iifths of each winding is in circuit. Correspondingly, if the connection is made 1o throu h leads Z3 and n3, only threedifths of each obbin is used, etc. In every case, however, the number of turns on the two bobbins is exactly the same, so that the magneto motive forces of thecurrent is perectly balanced, and not irregular in its magnetizing action upon the cores 5.

y The circuit controller 9 is of such a nature as to cut any desired number of leads into the telephone circuit. The practical construction used has two circular rows of contacts or pins 10 and 11, of which the row 10 are connected in order to the leads Z', Z2, Z3, Z4 and Z5, while the row 11 are connected in an order to the leads n', n2, n3, n4 and ra5.

12 and 13 denote spring blades, pivoted at the point 14, and bearing respectively on the pins 10 and 11, corresponding to a pair of opposite leads Z and n. The blades 12 and 13 are connected so as to angularly move together, and it is evident that they are put in connection with diHerent pairs of eads successively, as they are swung through their arc of throw or movement.

15 and 16 denote arcuate rings which 12 and 1'3 respectively. The rings 15 and 16 are made the terminals of the line or telephone circuit, including the transmitter, attery and the switch 7 as already described. 17 indicates a button'projecting throu h the casing 1, 'and which 1s connected to t e blades 12 and 13, so as to an ularly move the same lin use. This button Iias a pointer 18, moving over a graduated index or dial 19, so that the positions of the blades 12 and vmake continuous contact with the blades 13 on their ,pins is properly marked, and may be secured and maintained from the exterior of the closed casing.

The operation will be understood from the preceding description. The ap aratus being connected for use, a greater or ess sensitiveness is obtained by turning the button 17,

so that the pointer 18, registers with the' different marks or divisions 19. Turning the button in this way swings the blades 12 and 13 over the contacts 1() and 11 and connects different leads Z and n into the telephone circuit. When the leads Z and rn. are connected into the telephone circuit, the receiver is in its most sensitive condition, corresponding to the entire strength of the field magnet windings. When, however, the other leads are substituted in the telephone circuit, the strength is correspondingly reduced, so as to 'accord to the peculiar conditions of any particular person using the device.

What I claim, is v In a telephone receiver having two bob bins each sectionally wound with correspondin leads extending from the respectiv'e bobins, a circuit controller having two lrows of contacts respectively connected with said leads, a pair of s ring blades adapted to make contact simu taneously with a pair of corresponding contacts of the respective rows, and means projecting through the casing of the receiver for angularly moving said blades to make connection with different pairs of contacts, whereby the number of turns in the telephone circuit of the two bobbins is simultaneously varied, and the sensitiveness of the receiver varied.

In witness whereof, I subscribe my signature, in the presence of two witnesses.

Witnesses:

D. FARBER, WM. D. COLE. 

